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J Mech Behav Biomed Mater. 2017 Aug;72:66-73. doi: 10.1016/j.jmbbm.2017.04.020. Epub 2017 Apr 21.

Study of the compression and wear-resistance properties of freeze-cast Ti and Ti‒5W alloy foams for biomedical applications.

Author information

1
School of Materials Science and Engineering, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 20707, Republic of Korea.
2
V.A. Belyi Metal-Polymer Research Institute of National Academy of Sciences of Belarus, 32A Kirov Str., 246050 Gomel, Belarus.
3
Department of Materials Physics, Eötvös Loránd University, P.O.B. 32, H-1518 Budapest, Hungary.
4
School of Materials Science and Engineering, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 20707, Republic of Korea. Electronic address: heeman@kookmin.ac.kr.

Abstract

Ti and Ti‒5wt% W alloy foams were produced by freeze-casting process and their mechanical behaviors were compared. The Ti‒5W alloy foam showed a typical acicular Widmanstätten α/β structure with most of the W dissolved in the β phase. An electron-probe microanalysis revealed that approximately 2wt% W was uniformly dissolved in the Ti matrix of Ti‒5W alloy foam with few partially dissolved W particles. The compressive-yield strength of Ti‒5W alloy foam (~323MPa) was approximately 20% higher than that of the Ti foam (~256MPa) owing to the solid-solution-strengthening effect of W in the Ti matrix, which also resulted in a dramatic improvement in the wear resistance of Ti‒5W alloy foam. The compressive behaviors of the Ti and Ti‒5W alloy foams were predicted by analytical models and compared with the experimental values. Compared with the Gibson-Ashby and cellular-lattice-structure-in-square-orientation models of porous materials, the orientation-averaging method provided prediction results that are much more accurate in terms of both the Young's modulus and the yield strength of the Ti and Ti‒5W alloy foams.

KEYWORDS:

Compressive strain; Implant; Ti alloy foam; Wear

PMID:
28458028
DOI:
10.1016/j.jmbbm.2017.04.020
[Indexed for MEDLINE]

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